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Stapinski T.,AGH w Krakowie | MarszaLek K.,AGH w Krakowie | Jaglarz J.,Cracow University of Technology
Przeglad Elektrotechniczny | Year: 2014

In this paper authors analyzed the influence of antireflective coatings on glass surface of PV module and influence of ARC deposited on silicon surface of solar cells on optical properties of the system. The recommended values of thicknesses and refractive indices were estimated. These values are in a good agreement with results of optical measurements. © 2014, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Jurasz J.,AGH w Krakowie | Mikulik J.,AGH w Krakowie | Piasecki A.,Wydzial Zarzadzania
Przeglad Elektrotechniczny | Year: 2016

Climate change/variability is one of the factors that affects the pattern of electrical energy consumption. Where the temperature is perceived as dominant and of crucial role in demand forecasting. Conducted analysis shows that energy demand pattern in Poland is slowly changing, and the impact of warmer days becomes more distinguishable © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Improving energy efficiency remains one of the main objectives of the Polish energy policy. The paper presents the results of an analysis of the potential for energy efficiency savings in the Polish housing sector. The matrix of representative groups of buildings (4 groups - single-family houses, multi-family houses, up to eight floor- and above eight floor-blocks of flats) was applied. The analysis covers a period of 2012-2030 and is based on the assumption that a constant seasonal decrease in demand for heat in already existing building will be maintained. For newly constructed buildings the demand for heat will be at the level of energy-efficient buildings. The results of the analysis carried out within this study positively validate the instruments introduced to improve energy efficiency in the Polish housing sector.

Flaga S.,AGH w Krakowie | Oprzedkiewicz I.,AGH w Krakowie | Sapinski B.,AGH w Krakowie
Solid State Phenomena | Year: 2013

Magnetic Shape Memory Alloys (MSMA) constitute one of the newest groups of intelligent materials [9]. Although these materials have yet to find commercial applications, literature with information on the first pre-prototype actuators can already be found. The mechanism of operation of these actuators is based on the magnetic shape memory effect. During tests, the shifting of piston and current in the coil of the electromagnet were measured. Measurements were synchronized with set courses of this current coil of the actuator. The obtained results made it possible to make static characteristics for constant levels of current, and dynamic curves for constant values of frequency as well as to construct a mathematical model. In this work, the authors have described laboratory tests of an experimental actuator of this type. © (2013) Trans Tech Publications, Switzerland.

The paper discuses the design of a wideband multiple antennas receiver dedicated for wireless data reception in neural recording systems. The presented receiver operates in 4 GHz frequency band. It makes use of a matrix of wideband antennas to support proper data reception in very wide carrier frequencies range, to increase transmission range and to enable localization of the transmitter. Received signals are decoded and demodulated using an FPGA programmable logic. © 2014 Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Turcza P.,AGH w Krakowie | Marszalek Z.,AGH w Krakowie | Socha M.,AGH w Krakowie
Przeglad Elektrotechniczny | Year: 2015

Presented data compression algorithm dedicated to Brain-Machine Interface (BMI) system enables encoding of neural signals at data rate of 0.25 bits per sample with distortions below 3% rms. Reduction of transmitted data enables implantation of complete, multichannel BMI system along with telemetry unit and magnetic antenna. Full implantation of BMI system is essential for minimization risk of developing infections and enabling the animal to interact freely with the environment. © 2015, Przegląd Elektrotechniczny. All rights reserved.

Jurasz J.,Katedra Inzynierii Zarzadzania | Mikulik J.,AGH w Krakowie
Przeglad Elektrotechniczny | Year: 2016

This paper presents a method for forecasting energy demand based on WT-ANN (Wavelet Transform – Artificial Neural Network). Model has been developed and assessed for system data for the period 2002-2014. As input variables following have been considered: five levels of signal decomposition (t-1, t-2), values of time series (t-1, t-2) and qualitative variables denoting day of the week. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All Rights Reserved.

Naziemiec Z.,Instytut Ceramiki i Materialow Budowlanych | Saramak D.,AGH w Krakowie
Prace Naukowe Instytutu Gornictwa Politechniki Wroclawskiej | Year: 2013

The paper addresses the problems of sampling and preparation of grained material samples for further analyses. In the first sections the relationships between the minimal mass of the sample and its particle size composition, depending on the type of analysis, were presented. It was also presented a comparative analysis of particle size compositions of samples collected manually and with using of automatic sampling devices. There were also discussed common errors occurring at sampling and sample reduction, affecting the obtained results.

Naworyta W.,AGH w Krakowie
Prace Naukowe Instytutu Gornictwa Politechniki Wroclawskiej | Year: 2013

The sense of determining the direction of reclamation and the meaningful content of this term have been critically presented against the background of the law regulations and the mining practice. A review of reclamation directions and methods for choosing the appropriate reclamation of post-mining terrains has been conducted. The kinds of terrains after rock quarrying have been described together with their distinctive characteristics which have decisive influence on the choice of the reclamation direction. The most important conditionings for the choice of the kind of reclamation have been analysed, including economic, social and natural factors. The importance of cost optimisation of the reclamation venture have been highlighted together with the costs of infrastructure maintenance costs after the reclamation process is finished. The necessity for adjusting the reclamation process of the post-mining objects to their future functions has been justified while considering local conditions, including the demography. The difference between the social expectancies for a specific method of reclamation and the actual need resulting from the municipality's requirements has been distinguished. Critical reference to the reclamation practice in Polish rock quarrying has been made. Attention has been paid to insufficient use of the potential of the post-mining terrains and the necessity to change this situation for the improvement of the industry's public image in a social perception.

Szurlej A.,AGH W Krakowie | Kaminski J.,IGSMiE PAN | Suwala W.,AGH W Krakowie
Rynek Energii | Year: 2014

The European Union systematically strives to create the competitive natural gas market. In Poland, since July 1, 2007, the freedom of choice and change of the seller is entitled to all customers of electricity and natural gas, including households. In accordance with Energy Law, end users may individually benefit from the local network in order to purchase gas or electricity supplied from any vendor. Although the regulations for several years now allow the exercise of the TPA rule, in fact, only in the last years there has been a growing interest in this possibility. This paper describes the domestic natural gas market, with particular emphasis being brought to changes in the implementation of competition in the market. As a basic measure the number of changes of gas supplier was proposed. In some aspects, progress in the liberalisation of the gas market was compared to the electricity market, which is much more advanced in this aspect. In addition, the pace of liberalisation of the gas and electricity markets in Poland was compared with selected markets of EU member states, with the employment of the Herfindahl-Hirschman Index. The estimated impact of liberalisation on changes in price levels between countries was also discussed. The regulatory environment is very important for the intensification of efforts to liberalise fuels and energy markets.

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